looking for value? my dad got this bottle while visting Germany in '83 - I am trying to find any information possible on this - the label reads from above - Rheingau 1983er Winkeler Dachsberg Riesling Qualitatswein A.P.Nr 25 052 003 085 ERZEUGER-aBFOLLUNG WEINGUT sCHUMANN-NAGLER 6222 gEISENHEIM IM RHEINGAU 1,5L

Any info would be greatly appreciated!

THANK YOU!